I am unsure how to calculate part B and C of this question.

2. (5 points) Suppose Q d = 10,000 - 2 Px + 3 Py - 4.5M, where Px = $100, Py = $50, and M (income) = $2,000. (a) What is the own price elasticity of demand? Please show your calculations. (b) What is the cross price elasticity between good X and good Y? Please show your calculations. (c) What is the income elasticity of demand? Please show your calculations. Hint: For this question please look at the section "Obtaining Elasticities from Demand